Answered: Number of Defective Number of Defective…

Practical Management Science

6th Edition

ISBN:9781337406659

Author:WINSTON, Wayne L.

Publisher:WINSTON, Wayne L.

Chapter2: Introduction To Spreadsheet Modeling

Section: Chapter Questions

Problem 20P: Julie James is opening a lemonade stand. She believes the fixed cost per week of running the stand...

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Question

The data processing department of the Arizona Bank has five data entry clerks. Each working day their
supervisor verifies the accuracy of a random sample of 250 records. A record containing one or more
errors is considered defective and must be redone. The results of the last 30 samples are shown in the
table. All were checked to make sure that none was out of control.

a. Based on these historical data, set up a p-chart using z = 3.
b. Samples for the next 4 days showed the following:

Number of Defective
Number of Defective
Records
Number of Defective
Number of Defective
Sample
Records
Sample
Records
Sample
Records
Sample
1
7
9
17
12
24
7
2
5
10
13
18
4
25
13
3
19
11
18
19
6.
26
10
4
10
12
20
11
27
14
5
11
13
16
21
17
28
6.
6.
8
14
4
22
12
29
11
7
12
15
11
23
30
9.
8
9
16
8.
Total
300

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